With the machine running, drop ginger into the bowl of a food processor and process until coarsely chopped. Scrape down the sides of the bowl, then add scallions, mint, cilantro, yogurt, jalapeno, lime juice, and salt. Process to a textured paste similar in consistency to pesto, adding water to adjust the consistency, if desired.
Cook's Note: This chutney's also great with grilled lamb and chicken, and super as a spread for sandwiches, rice crackers, or crispy Indian pappadam.